When taking Night Photography you will use long exposures. Sometimes these exposures can be very long. My question is this:
How can I take long exposures without turning a night scene into a scene that looks like its daylight? I have used ISO 100 and the smallest aperture possible. I have thought of using a neutral density filter similar to how you would in daylight to capture flowing water etc but I am not sure if this would work for night scene.
An example would be shooting star trials with a tree in the picture. The tree comes out looking like the photo was taken in daylight.
I have thought of using multiple exposures with multiple images and blending them in Photoshop but that is not always the easiest and if I can compose in camera all the better.
If it matters I am using a Nikon D5100.